Method of protecting buildings from termite attack

A method of protecting a building from damage by termites, comprising the steps of:

• detecting the presence of termites within the building or within close proximity thereof,
• infusing a protected region of ground below the building with ozone by delivering ozone into said protected region at a determined concentration which is less than that at which its presence would cause harmful effects on humans occupying the building and sufficient to cause the termites to vacate the protected region,
• detecting the absence of termites in said protected region,
• discontinuing the delivery of ozone to said protected region,
• monitoring the protected region to detect the return of termites thereto, and determining the time elapsed since delivery of ozone was discontinued,
• recommencing delivery of ozone at the said determined concentration until the termites again vacate the said protected region, and
• repeating the periodic delivery of ozone at intervals and for time periods determined by the said detection of the presence and absence of the termites.